5. Ford Escort: 20M units sold
Despite being discontinued back in 2000, the European Ford Escort still takes fifth place as a small, fuel-efficient car originally sold in England in 1967 as a 1968 model. Its popularity in England allowed for six generations of European Escorts with each update offering more options and a larger engine. It’s worth mentioning that the American Escort isn’t counted here, because it wasn’t related to the European model.